G'day boosth,
Welcome to the monastery.
Without seeing any code, input, actual output, expected output or error messages, it's not possible to advise you what's causing your problems.
perl5101delta describes the differences between Perl v5.10.0 and Perl v5.10.1 - a number of these differences are listed under Incompatible Changes.
Also, it's possible that modules you are using need to be recompiled for the new Perl version.
While your logic may not have changed, how that logic is implemented under the hood may well be different.
To get a better answer, you'll need to provide more information. Guidelines for doing this can be found in: How do I post a question effectively?
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